Surface Water Management Division
Lake Martha (North)
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Lake Martha is located in the Seven Lakes area north of the Tulalip Reservation. The lake is 59 acres in size and one of the deepest lakes in the county, with a maximum depth of 21.3 meters. Lake Martha’s immediate watershed is large at 801 acres and is primarily undeveloped. There is a public boat launch on the north side of the lake. Gas-powered boats are not permitted on the lake.ke Martha |
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Water Quality Information
Summary
Lake Martha has moderate to high water clarity, moderate phosphorus levels, and regular algal blooms. The lake shows signs of increasing eutrophication, such as phosphorus build-up in the bottom waters and blue-green algal blooms. The lake may be at risk of future declines in water quality unless nutrient runoff from the surrounding watershed is controlled.
Reports
A comprehensive Snohomish County State of the Lakes Report was produced in 2003 and includes a specific section on Lake Martha. Individual lake updates to this report are provided each year as new data are collected.
Data
Snohomish County Surface Water Management (SWM) together with volunteer lake-monitors have been collecting water quality data for Lake Martha since 1994. Current and historical lake water quality data are available online in SWM's interactive Water Quality Database.
Lake Martha Maps
- Bathymetric Map - this map shows contour lines of equal depth similar to a topographic map. Public access sites are also indicated on each map when applicable.
- Aerial Photo - 2007 aerial photos of the lake with relevant features such as public access sites and nearby roads.
- Watershed Map - this map shows the boundary of the Lake Martha watershed. A watershed is the land area that drains into the lake.
Lake Martha Resources
Contact
Gene Williams, Senior Planner, 425-388-3464 extension 4563
Marisa Burghdoff, Water Quality Analyst, 425-388-3464 extension 4639
Some documents are in pdf format. To read these files you'll need to have Adobe Acrobat Reader installed on your computer.